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+Basic build
+ make config T=x86_64-default-linuxapp-gcc && make
+Build commands
+ config get configuration from target template (T=)
+ all same as build (default rule)
+ build build in a configured directory
+ clean remove files but keep configuration
+ install build many targets (wildcard allowed) in fixed directories
+ uninstall remove all installed targets
+Build variables
+ CROSS toolchain prefix
+ EXTRA_CPPFLAGS preprocessor options
+ EXTRA_CFLAGS compiler options
+ EXTRA_LDFLAGS linker options
+ RTE_KERNELDIR linux headers path
+ V verbose
+ D debug dependencies
+ O output directory (default: build/) - cannot be used with install
+ T target template (install default: *) - used with config or install
+ format: <arch-machine-execenv-toolchain>
+ templates in config/defconfig_*